JPH04180423A - Traffic measuring device - Google Patents

Abstract

PURPOSE:To measure the traffic between terminal equipments of a LAN with simple constitution by extracting information required for detecting the traffic from a decoded data. CONSTITUTION:A traffic information extraction means 3 extracts only a destination address, a sender address and frame length information required for measuring the traffic in the information of a frame received by a signal reception means 1 and a Manchester decode means 2. The time when the traffic information is obtained is detected by a detection means 4 and stored in a memory 6 by a storage means 5. Then the content of the memory 6 is read by a read means 7, and a calculation means 8 calculates the traffic and sends the result of calculation to a display means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traffic measuring device that measures the amount of traffic on a LAN.

[Background Art] In recent years, with the spread of LAN, many terminal devices have come to be connected to one LAN.

As a result, the amount of traffic on the LAN increases, causing a decline in the transmission performance of the entire system. In order to improve this problem, the LAN is divided into a plurality of parts, and the LANs are interconnected by bridges, routers, etc. In other words, LAN partitioning reduces communication between LANs.
Divide the LAN so that there is more communication within the LAN. For this purpose, a device was needed to measure the amount of unused traffic at each end.

[Problems to be Solved by the Invention] However, in order to measure the amount of traffic between each terminal, it is necessary to use an expensive measuring device called a protocol analyzer that can also monitor network conditions other than the amount of traffic.

The present invention has been made in view of the above points, and its purpose is to provide a simple structure that can be used in LA.
An object of the present invention is to provide an inexpensive traffic measuring device capable of measuring the amount of traffic between N terminals.

[Means for Solving the Problems] In order to solve the above problems, the traffic measurement device of the present invention, as shown in FIG. A signal receiving means 1 receives the data, a Manchester decoding means 2 decodes the received data, and traffic information extracts destination address, source address, and frame length information necessary for traffic detection from the decoded data. extraction means 3; time detection means 4 for detecting time; memory storage means 5 for storing information on destination address, source address, frame length and time in memory; and information storage for storing information. A memory 6, a memory reading means 7 for reading information from the information storage memory 6, and a traffic amount calculation means 8 for calculating the amount of traffic from the read information.
It is characterized by comprising a calculation result display means 9 for displaying calculation results.

The trap information extracting means 3 includes a first bit removing means 31 for removing the first bit, a shift register 32 for storing information of a destination address, a source address, and a frame length. It is preferable to include frame start delimiter detection means 33 for detecting a location where the delimiter becomes 1.

[Function] The present invention focuses on the fact that all the information of a frame is not necessary to measure the traffic amount of a LAN, and the information of the frame received by the signal receiving means 1 and the Manchester decoding means 2 is From the information, the traffic information extraction means 3 extracts only the destination address, source address, and frame length information necessary for measuring the traffic amount, and the time detection means 4 detects the time when the traffic information was obtained. The information is stored in the information storage memory 6 by the memory storage means 5, read out by the memory reading means 7, the traffic amount is calculated by the traffic amount calculation means 8, and displayed by the calculation result display means 9, so that the protocol analyzer It is possible to easily measure the amount of LAN traffic without using an expensive measuring device such as .

In addition, as shown in FIG. 2, the traffic information extraction means 3
a first bit removing means 31 for removing the first bit;
If it is composed of a shift register 32 that stores the destination address, source address, and frame length, and a frame start delimiter detection means 33 that detects the location where two consecutive bits become 1, it is possible to eliminate several bits of the preamble. Even if
The frame start delimiter can be reliably detected, and the subsequent information on the destination address, source address, and frame length can be accurately extracted.

[Example]· FIG. 1 is a block diagram of one embodiment of the present invention.

Signals on the LAN are taken into the apparatus by signal receiving means 1 and decoded by Manchester decoding means 2.

Next, the traffic information extracting means 3 extracts the destination address, source address, and frame length information necessary for calculating the traffic amount from the frame. Therefore, time information is extracted by the time detection means 4.

Information such as the destination address, source address, frame length, and time is taken into the information storage memory 6 by the memory storage means 5. After the information for the time for measuring the amount of traffic is stored in the information storage memory 6/\, the information is read out by the memory reading means 7, and the amount of traffic is calculated by the traffic amount calculation means 8. The amount of traffic from terminal i to terminal j is from terminal i to terminal j in seconds.
If n bits are sent to j
, the amount of traffic from terminal i to terminal j can be calculated by adding the frame lengths such that the source address becomes i and dividing by the total time. This calculation result is displayed on a display or printer by a calculation result display means 9.

A detailed configuration of the above traffic information extraction means 3 is shown in FIG. Furthermore, the frame structure of the LAN is shown in FIG.

One octet of the preamble is “10101010”
It consists of Also, the frame start delimiter is 1
It is "'10101011" in octets. moreover,
Since the destination address is 6 octets, the source address is 6 octets, and the frame length is 2 octets,
A total of 14 octets of information are extracted from the frame =
It becomes 112 bits.

Therefore, as shown in FIG. 2, the Manchester decoded data is input to the 114-bit shift register 32. If the initial state is shifted and all bits of register 32 are cleared to 0, shift register 3
The time when the last two bits of 2 become ``11'' for the first time is when the last two bits of the frame start delimiter are detected.Therefore, the frame start delimiter detects that the last two bits become 11''. The detection means 33 is “11”
The remaining 112 bits of the shift register 32 at the time of detection become the information to be extracted. However, with this configuration, if some bits of the preamble are missing in the middle and the first bit is erroneously decoded as 1 even though it is 0, the 01 in the preamble is The pattern becomes "11" and the frame start delimiter detection means 33 works even though it is a preamble. In order to prevent this, malfunctions are prevented by a first bit removal means 31 that removes the first bit that may be erroneously decoded.

Note that when measuring the amount of traffic, there must be no data loss, so the destination address, source address, and frame length are stored in the information storage memory 61 in real time using hardware. However, displaying the traffic amount based on this information does not need to be processed at high speed, so it can be processed using a microcomputer.

[Effects of the Invention] In the invention described in claim 1, the destination address, source address, and frame length required for traffic detection are determined from the data received from the transmission path by the signal receiving means and decoded by the Manchester decoding means. Information is extracted by a traffic information extraction means, and only information necessary for traffic measurement is selectively used, so LAN traffic can be measured with a simple configuration.

Further, the destination address, the source address, the frame length extracted by the traffic information extraction means, and the time information detected by the time detection means are stored in the information storage memory by the memory storage means, and read by the memory reading means, Since the traffic information is calculated by the traffic amount calculation means and displayed by the calculation result display means, the traffic information extraction means must extract the traffic information in real time and store it in the information storage memory, but the traffic amount calculation means cannot extract the traffic information in real time. There is no need to calculate the traffic, and therefore the device can be constructed at low cost using a microcomputer.

Further, in the invention as claimed in claim 2, the frame start delimiter is detected by removing the first bit and then detecting a place where two consecutive bits become 1. This has the effect that the position can be detected accurately, and therefore the subsequent information on the destination address, source address, and frame length can be accurately stored in the shift register.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing a detailed configuration of a traffic information extracting means used in the same, and FIG. 3 is a configuration diagram of a LAN frame. 1 is a signal receiving means, 2 is a Manchester decoding means, 3 is a traffic information extraction means, 4 is a time detection means, 5 is a memory storage means, 6 is an information storage memory, 7 is a memory reading means, 8 is a traffic amount calculation means , 9 is a calculation result display means, 31 is a first bit removal means, 32 is a shift register, and 33 is a frame start delimiter detection means.

Claims (2)

[Claims] (1) A signal receiving means for receiving Manchester encoded data transmitted through a transmission path, a Manchester decoding means for decoding the received data, and a destination address necessary for traffic detection from the decoded data. , traffic information extraction means for extracting information on a source address and frame length; time detection means for detecting time; and memory storage means for storing information on a destination address, source address, frame length and time in a memory. , an information storage memory for storing information, a memory reading means for reading information from the information storage memory, a traffic amount calculation means for calculating the traffic amount from the read information, and a calculation result display for displaying the calculation results. A traffic measuring device comprising: means. (2) The traffic information extraction means includes a first bit removal means for removing the first bit, a shift register for storing information of a destination address, a source address, and a frame length, and a shift register that stores information of a destination address, a source address, and a frame length, and a 2. The traffic measuring device according to claim 1, further comprising a frame start delimiter detecting means for detecting a point where a frame start delimiter detects a frame start delimiter.